diff --git a/apps/plugins/mpegplayer/video_out_rockbox.c b/apps/plugins/mpegplayer/video_out_rockbox.c
index c659600d41..b05a229083 100644
--- a/apps/plugins/mpegplayer/video_out_rockbox.c
+++ b/apps/plugins/mpegplayer/video_out_rockbox.c
@@ -371,7 +371,9 @@ bool vo_draw_frame_thumb(uint8_t * const * buf, const struct vo_rect *rc)
     uint8_t *yuv[3];
     struct vo_rect thumb_rc;
     int thumb_width, thumb_height;
+#ifdef HAVE_LCD_COLOR
     int thumb_uv_width, thumb_uv_height;
+#endif
 
     /* Obtain rectangle as clipped to the screen */
     vo_rect_set_ext(&thumb_rc, 0, 0, LCD_WIDTH, LCD_HEIGHT);
@@ -386,11 +388,15 @@ bool vo_draw_frame_thumb(uint8_t * const * buf, const struct vo_rect *rc)
 
     thumb_width = rc->r - rc->l;
     thumb_height = rc->b - rc->t;
+#ifdef HAVE_LCD_COLOR
     thumb_uv_width = thumb_width / 2;
     thumb_uv_height = thumb_height / 2;
 
     DEBUGF("thumb: w: %d h: %d uvw: %d uvh: %d\n", thumb_width,
            thumb_height, thumb_uv_width, thumb_uv_height);
+#else
+    DEBUGF("thumb: w: %d h: %d\n", thumb_width, thumb_height);
+#endif
 
     /* Use remaining mpeg2 buffer as temp space */
     mem = mpeg2_get_buf(&bufsize);
diff --git a/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4740.c b/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4740.c
index 0ce0ed1e19..1ae3bb2cc8 100644
--- a/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4740.c
+++ b/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4740.c
@@ -341,7 +341,7 @@ static int jz_nand_read_oob(unsigned long page_addr, unsigned char *buf, int siz
 static int jz_nand_read_page(unsigned long page_addr, unsigned char *dst)
 {
     struct nand_param *nandp = &internal_param;
-    int page_size, oob_size, page_per_block;
+    int page_size, oob_size;
     int row_cycle, bus_width, ecc_count;
     int i;
 #ifdef USE_ECC
@@ -355,7 +355,6 @@ static int jz_nand_read_page(unsigned long page_addr, unsigned char *dst)
 
     page_size = nandp->page_size;
     oob_size = nandp->oob_size;
-    page_per_block = nandp->page_per_block;
     row_cycle = nandp->row_cycle;
     bus_width = nandp->bus_width;
 
diff --git a/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4760.c b/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4760.c
index b3cc589528..3b1a1aad59 100644
--- a/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4760.c
+++ b/firmware/target/mips/ingenic_jz47xx/ata-nand-jz4760.c
@@ -340,7 +340,7 @@ static int jz_nand_read_oob(unsigned long page_addr, unsigned char *buf, int siz
 static int jz_nand_read_page(unsigned long page_addr, unsigned char *dst)
 {
     struct nand_param *nandp = &internal_param;
-    int page_size, oob_size, page_per_block;
+    int page_size, oob_size;
     int row_cycle, bus_width, ecc_count;
     int i;
 #ifdef USE_ECC
@@ -351,7 +351,6 @@ static int jz_nand_read_page(unsigned long page_addr, unsigned char *dst)
     
     page_size = nandp->page_size;
     oob_size = nandp->oob_size;
-    page_per_block = nandp->page_per_block;
     row_cycle = nandp->row_cycle;
     bus_width = nandp->bus_width;
 
diff --git a/firmware/target/mips/ingenic_jz47xx/onda_vx747/sadc-onda_vx747.c b/firmware/target/mips/ingenic_jz47xx/onda_vx747/sadc-onda_vx747.c
index d06cb28f40..7d3b3a10d1 100644
--- a/firmware/target/mips/ingenic_jz47xx/onda_vx747/sadc-onda_vx747.c
+++ b/firmware/target/mips/ingenic_jz47xx/onda_vx747/sadc-onda_vx747.c
@@ -110,6 +110,7 @@ int _battery_voltage(void)
 
     dummy = REG_SADC_BATDAT;
     dummy = REG_SADC_BATDAT;
+    (void)dummy;
 
     REG_SADC_ENA |= SADC_ENA_PBATEN;
 
diff --git a/firmware/target/mips/ingenic_jz47xx/onda_vx767/sadc-onda_vx767.c b/firmware/target/mips/ingenic_jz47xx/onda_vx767/sadc-onda_vx767.c
index 710da6b729..ca9a0e617d 100644
--- a/firmware/target/mips/ingenic_jz47xx/onda_vx767/sadc-onda_vx767.c
+++ b/firmware/target/mips/ingenic_jz47xx/onda_vx767/sadc-onda_vx767.c
@@ -75,7 +75,8 @@ int _battery_voltage(void)
     
     dummy = REG_SADC_BATDAT;
     dummy = REG_SADC_BATDAT;
-    
+    (void)dummy;
+
     REG_SADC_ENA |= SADC_ENA_PBATEN;
     bat_val = 0;